ET MALWARE RShell Backdoor Keepalive

Query · suricata

flow:established,to_server;
dsize:25;
content:"|19 00 00 00 02 74 79 70 65 00 0a 00 00 00 6b 65 65 70 61 6c 69 76 65 00 00|"; fast_pattern;
threshold:type limit, track by_src, seconds 500, count 1;
Raw source ET MALWARE RShell Backdoor Keepalive · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE RShell Backdoor Keepalive";
    flow:established,to_server;
    dsize:25;
    content:"|19 00 00 00 02 74 79 70 65 00 0a 00 00 00 6b 65 65 70 61 6c 69 76 65 00 00|"; fast_pattern;
    threshold:type limit, track by_src, seconds 500, count 1;
    reference:url,blog.sekoia.io/luckymouse-uses-a-backdoored-electron-app-to-target-macos;
    reference:url,www.trendmicro.com/en_us/research/22/h/irontiger-compromises-chat-app-Mimi-targets-windows-mac-linux-users.html;
    classtype:command-and-control;
    sid:2038536; rev:1;
    metadata:attack_target Client_and_Server, created_at 2022_08_16, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2022_08_16;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.